Match each clinical presentation with its most likely underlying vascular pathology or pathophysiologic mechanism.
- An elderly male patient with known paroxysmal atrial fibrillation develops abrupt, excruciating periumbilical pain. Despite his distress, his abdominal examination is remarkably soft and non-tender. His serum lactate level is markedly elevated at 4.5 mmol/L.Acute macroembolic occlusion of the superior mesenteric artery
- A female patient with a significant smoking history and severe peripheral arterial disease reports a 15-kg (33-lb) weight loss over the past 6 months. She describes a dull, cramping epigastric ache that predictably starts 30 to 45 minutes after meals, leading her to avoid eating.Atherosclerotic critical stenosis of multiple major splanchnic arteries
- Two weeks after experiencing an anterior ST-elevation myocardial infarction, a male patient develops abrupt, severe pain and pallor in his right lower extremity. Neurologic exam reveals an inability to dorsiflex the right foot, and both the right popliteal and pedal pulses are completely absent.Arterial macroembolization originating from a left ventricular mural thrombus
- A male patient with a documented 3.5-cm popliteal artery aneurysm reports the sudden appearance of scattered, exquisitely tender, blue-purple macular lesions on the toes of his right foot. Vascular examination demonstrates symmetric, bounding pedal pulses bilaterally.Arterial microembolization of atherothrombotic debris from a peripheral aneurysm
Answer
Patient 1 matches with Acute macroembolic occlusion of the SMA. Patient 2 matches with Atherosclerotic critical stenosis of splanchnic arteries. Patient 3 matches with Arterial macroembolization from an LV thrombus. Patient 4 matches with Arterial microembolization from a peripheral aneurysm.
Each clinical vignette provides specific clues pointing to distinct pathophysiologic mechanisms of vascular disease. Atrial fibrillation suggests a cardiac embolic source to the gut (SMA). Postprandial pain implies a chronic demand-supply mismatch (chronic mesenteric ischemia). A recent anterior MI suggests a ventricular mural thrombus embolizing to a major limb artery. A popliteal aneurysm with blue toes and palpable pulses points to distal microembolization of mural debris.
Step-by-Step Solution
Key Concept
Clinical presentations of major vascular occlusive diseases (macroembolic versus microembolic, acute versus chronic).